with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 2

28

Sulfur atoms

C

CHEMISTRY; METALLURGY

07

ORGANIC CHEMISTRY

D

HETEROCYCLIC COMPOUNDS

401

Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom

02

containing two hetero rings

04

directly linked by a ring-member-to-ring- member bond

C

CHEMISTRY; METALLURGY

07

ORGANIC CHEMISTRY

D

HETEROCYCLIC COMPOUNDS

401

Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom

02

containing two hetero rings

12

linked by a chain containing hetero atoms as chain links

C

CHEMISTRY; METALLURGY

07

ORGANIC CHEMISTRY

D

HETEROCYCLIC COMPOUNDS

403

Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/167

02

containing two hetero rings

04

directly linked by a ring-member-to-ring- member bond

C

CHEMISTRY; METALLURGY

07

ORGANIC CHEMISTRY

D

HETEROCYCLIC COMPOUNDS

405

Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom

02

containing two hetero rings

04

directly linked by a ring-member-to-ring- member bond

C

CHEMISTRY; METALLURGY

07

ORGANIC CHEMISTRY

D

HETEROCYCLIC COMPOUNDS

405

Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom

02

containing two hetero rings

12

linked by a chain containing hetero atoms as chain links

C

CHEMISTRY; METALLURGY

07

ORGANIC CHEMISTRY

D

HETEROCYCLIC COMPOUNDS

471

Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/-C07D463/251